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Color picking made simple

If I see a color on my computer screen that I'd like to use somewhere else, I want to know that color's hexadecimal code. Conversely, if I see a color's hex code, I want to know what that coded color looks like on-screen. Some time back, I wanted an application that does both those jobs simply in Linux. The best tool I found was gcolor2, described below. It's great for finding hex codes, but it doesn't display colors in a large enough 'swatch' to suit me. To do that job I wrote a simple script, also described below.